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libuser.conf: configuration for libuser and libuser utilities

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Command to display libuser.conf manual in Linux: $ man 5 libuser.conf

NAME

libuser.conf - configuration for libuser and libuser utilities

FILE FORMAT

libuser.confis a text file.Leading and trailing white space on each line is ignored.Lines starting with#are ignored.

The file defines variables grouped into sections. Each section starts witha section header:

variable=value

Thevaluecan be empty.

Avariablecan have more than one value, specified by using more than one linedefining that variable.All currently defined variables accept only the first value and ignorethe others, if any.

[defaults]

create_modules

A list of module names to use when creating user or group entries,unless the application specifies a different list.The module names in the list can be separated using space, tab or comma.Default value is files shadow.

crypt_style

The algorithm to use for password encryption when creating new passwords.The current algorithm may be retainedwhen changing a password of an existing user, depending on the application.

Possible values are des, md5, blowfish,sha256and sha512, all case-insensitive.Unrecognized values are treated as des.Default value is des.

hash_rounds_min, hash_rounds_max

These variables specify an inclusive range of hash rounds used whencrypt_styleissha256or sha512.A number of hash rounds is chosen from this interval randomly.A larger number of rounds makes password checking, and brute-force attemptsto guess the password by reversing the hash, more CPU-intensive.The number of rounds is restricted to the interval [1000, 999999999].

If only one of the above variables is specified, the number of rounds used isspecified by the other variable.If neither variable is specified, the number of rounds is chosen by libc.

mailspooldir

The directory containing user's mail spool files.Default value is /var/mail.

moduledir

The directory containinglibusermodules.Default value uses the modules installed with libuser,corresponding to the architecture of thelibuserlibrary,e.g. /usr/lib/libuser or /usr/lib64/libuser(assuminglibuserwas configured with --prefix=/usr).

modules

A list of module names to use when not creating user or group entries,unless the application specifies a different list.The module names in the list can be separated using space, tab or comma.Default value is files shadow.

skeleton

The directory containing files to copy to newly created home directories.Default value is /etc/skel.

[import]

login_defs

A path to thelogin.defsfile from shadow.If this variable is defined,the variables from the named file are used in place of somelibuservariables.Variables explicitly defined inlibuser.confare not affected by contents of login.defs.The following variables are imported:

Variable	Imported as
ENCRYPT_METHOD
GID_MIN	groupdefaults/LU_GIDNUMBER
MAIL_DIR	defaults/mailspooldir
MD5_CRYPT_ENAB	defaults/crypt_style
PASS_MAX_DAYS	userdefaults/LU_SHADOWMAX
PASS_MIN_DAYS	userdefaults/LU_SHADOWMIN
PASS_WARN_AGE	userdefaults/LU_SHADOWWARNING
SHA_CRYPT_MIN_ROUNDS	defaults/hash_rounds_min
SHA_CRYPT_MAX_ROUNDS	defaults/hash_rounds_max
UID_MIN	userdefaults/LU_UIDNUMBER

The following variables arenotimported:CREATE_HOME, GID_MAX, MAIL_FILE, SYSLOG_SG_ENAB,UID_MAX, UMASK, USERDEL_CMD, USERGROUPS_ENAB

default_useradd

A path to thedefault/useraddfile fromuseraddin shadow.If this variable is defined,the variables from the named file are used in place of somelibuservariables.Variables explicitly defined inlibuser.confare not affected by contents of default/useradd.The following variables are imported:

Variable	Imported as
EXPIRE
GROUP	userdefaults/LU_GIDNUMBER
HOME	userdefaults/LU_HOMEDIRECTORY
INACTIVE	userdefaults/LU_SHADOWINACTIVE
SHELL	userdefaults/LU_LOGINSHELL
SKEL	defaults/skeleton

TheHOMEvariable value has/%nappended to it before importing.

[userdefaults]

This section defines attribute values of newly created user entities.There is one special variable:

%character and avoid this substitution.

After theuserdefaultssection is processed, modules may define additional attributesor even override the attributes defined in this section.

[groupdefaults]

Thegroupdefaultssection is similar to userdefaults.There is one special variable:

After thegroupdefaultssection is processed, modules may define additional attributesor even override the attributes defined in this section.

[files]

Configures thefilesmodule, which manages/etc/groupand /etc/passwd.The configuration variables are probably useful only forlibuserdevelopment.

directory

The directory containing thegshadowandshadowfiles.Default value is /etc.

nonroot

Allow module initialization when not invoked as therootuser if the value is yes.

[ldap]

Configures theldapmodule, which manages an user database accessible using LDAP.

userBranch

The LDAP suffix for user entities.Default value is ou=People.

groupBranch

The LDAP suffix for group entities.Default value is ou=Group.

server

A domain name or an URI of the LDAP server.The URI can use the ldap,ldapior theldapsprotocol.When a simple domain name is used,the connection fails if TLS can not be used;an URI using theldapprotocol allows connection without TLS.TLS is never used with theldapiprotocol.Default value is ldap.

basedn

The base DN of the server.Default value is dc=example,dc=com.

binddn

A DN for binding to the server.If the value is empty or binding using this DN fails,a DN of uid=user,userBranch,basedn is used, whereuserBranchandbasednare variables from this sectionanduseris the user name of the invoking user, unless overridden by theuservariable from this section.Default value is cn=manager,dc=example,dc=com.

user

The SASLv2 identity for authenticating to the LDAP server,also overrides the user name for generating a bind DN.Default value is the name of the invoking user.

password

The password used for a simple bind by default. If not specified, there isno default and the user must supply the password each time.

IT IS STRONGLY RECOMMENDED NOT TO STORE A PASSWORD IN THE SYSTEM-WIDE/etc/libuser.confFILE.The configuration file is world-readable by default,and setuid programs that prompt for a server name could be usedto send the password to an attacker-controlled server.

authuser

The SASLv2 authorization user, if non-empty.Default value is empty.

bindtype

The list of bind types to use, separated by commas.Allowed bind types are simple, sasl, and sasl/mechanism,wheremechanismis a SASL mechanism.The bind types (but not necessarily mechanism) are case-insensitive.If more than one bind type is specified, their relative order is ignored.Default value is simple,sasl.

[sasl]

Configures thesaslmodule, which manages a SASLv2 user database.

/etc/libuser.conf

The default location of the configuration file. Can be overriddenby theLIBUSER_CONFenvironment variable, except in set-uid or set-gid programs.

Pages related to libuser.conf

Libxerces

• libuser (5) - configuration for libuser and libuser utilities
• libao.conf (5) - configuration for libao.
• libao (5) - configuration for libao.
• libaudit.conf (5) - libaudit configuration file
• libaudit (5) - libaudit configuration file
• libguestfs-tools.conf (5) - configuration file for guestfish, guestmount, virt-rescue
• libipmiconsole.conf (5) - specify default values for libipmiconsole

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